Instrukcja obsługi Microchip SY89112U

Microchip nieskategoryzowany SY89112U

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 2023 Microchip Technology Inc. and its subsidiaries DS20006829A-page 1

SY89112U

Features

• Selects Between 1 of 2 Inputs and Provides 12

Precision, Low-Skew LVPECL Output Copies

• Ensured AC Performance over Temperature and

Voltage:

- DC to >2 GHz Throughput

- <550 ps Propagation Delay CLK-to-Q

- <220 ps Rise/Fall Time

- <25 ps Output-to-Output Skew

• Ultra-Low Jitter Design:

- 50 fsRMS Typical Phase Jitter

- <0.7 psRMS Crosstalk-Induced Jitter

• Unique, Patent-Pending Input Termination and VT

Pin Accepts DC-Coupled and AC-Coupled

Differential Pins

• Unique, Patent-Pending 2:1 Input MUX Provides

Superior Isolation to Minimize

Channel-to-Channel Crosstalk

• 800 mV, 100K LVPECL Output Swing

• Power Supply: 2.5V ±5% or 3.3V ±10%

• Industrial Temperature Range: –40°C to +85°C

• Available in 44-Lead (7 mm x 7 mm) VQFN

Package

Applications

• Multi-Processor Server

• SONET/SDH Clock/Data Distribution

• Fibre Channel Distribution

• Gigabit Ethernet Clock Distribution

General Description

The SY89112U is a low-jitter, low-skew, high-speed

LVPECL 1:12 differential fanout buffer optimized for

precision telecom and enterprise server distribution

applications. The input includes a 2:1 MUX for clock

switchover applications. Unlike other multiplexers, this

input includes a unique isolation design to minimize

channel-to-channel crosstalk. The SY89112U

distributes clock frequencies from DC to >2 GHz

ensured over temperature and voltage. The SY89112U

incorporates a synchronous output enable (EN) so that

the outputs will only be enabled/disabled when they are

already in the LOW state. This reduces the chance of

generating “runt” clock pulses.

The SY89112U differential input includes Microchip’s

unique, patent-pending 3-pin input termination

architecture that directly interfaces to any differential

signal (AC- or DC-coupled) as small as 100 mV

(200 mVPP) without any level shifting or termination

resistor networks in the signal path. For AC-coupled

input interface, an on-board output reference voltage

(VREF-AC) is provided to bias the center-tap (VT) pin.

The outputs are 800 mV, 100K compatible LVPECL

with fast rise/fall times ensured to be less than 220 ps.

The SY89112U operates from a 2.5V ±5% or 3.3V

±10% supply and is ensured over the full industrial

temperature range of –40°C to +85°C. The SY89112U

is part of Microchip’s high-speed, Precision Edge®

product line.

Package Type

SY89112U

44-Lead VQFN (M)

(Top View)

2.5V/3.3V Low-Jitter, Low-Skew 1:12 LVPECL Fanout Buffer

with 2:1 MUX Input and Internal Termination

 2023 Microchip Technology Inc. and its subsidiaries DS20006829A-page 2

SY89112U

Functional Block Diagram

 2023 Microchip Technology Inc. and its subsidiaries DS20006829A-page 3

SY89112U

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings †

Supply Voltage (VCC) ................................................................................................................................... –0.5V to +4V

Input Voltage (VIN) ....................................................................................................................................... –0.5V to V

LVPECL Continuous Output Current (IOUT) ............................................................................................................50 mA

LVPECL Surge Output Current (IOUT)...................................................................................................................100 mA

Source or Sink Current on VT Pin.......................................................................................................................±100 mA

Source or Sink Current on CLK, /CLK...................................................................................................................±50 mA

Source or Sink Current on VREF-AC Pin................................................................................................................±2 mA

Operating Ratings ‡

Supply Voltage (VCC) ........................................................................................................................ +2.375V to +2.625V

Supply Voltage (VCC) ................................................................................................................................ +3.0V to +3.6V